<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>06.数组解构</title>
</head>
<body>
    <script type="text/javascript">
        // 数组的解构赋值
        // 允许我们按照一一对应的关系，从数组中提取出来，然后赋值给变量

        let arr = [1,2,3];
        let a = arr[0];
        let b = arr[1];
        let c = arr[2];
        console.log(a,b,c);   // 1 2 3 

        // 等价写法
        let [x,y,z,w] = arr;
        console.log(x,y,z,w);  // 1 2 3 undefined

    </script>
</body>
</html>